80 



The cervicals are longer than wide, and coiisiderahly compressed in form 

 anteriorly, but depressed posteriorly. This is partly due to pressure, l)ut not 

 wholly; and it is likely that the i)osterior centra are abont as transverse as 

 in Cimoliamttrus magnus, Leidy ; while the anterior are relatively several 

 times as long. In (he length, ihe latter resemble the English Plesiosauri, 

 in which the centra arc also (•()nii)ressed. The compressed anterior centra 

 exhibit a ridge on the side above the middle. A more massive ridge extends 

 between the articular extremities at the lower part ol' the side, and presents 

 a pit for the parapophysis. The pit for the neural spine is of nearly simihir 

 size. Where the cervicals begin to be depressed, two foramina appear near 

 together on the inferior face, and the articular extremities display an open 

 obtuse emargination below. They are also eniarginate for the neural canal 

 above, so as to have a form approaching a transverse figure 8. In the large; 

 posterior cervicals, the sides are contracted both below and at the sides. In 

 all the cervicals, the articular fiices are a little concave; in the larger, with some 

 median convexities. 



In none of the dorsals preserved are the diapophyses seen to issue from the 

 centra; hence the tbrmer are probably not posterior in position. The centra 

 soon become smaller than those of the posterior cervicals, and are sul)round 

 in section, with a well-marked emargination for the neural canal. The sides 

 are gently concave, and are without angulation, but are marked near the 

 articular extremity with short, sharp, and regular undivided ridges, eight in 

 a half-inch. The articular faces are slightly concave and without ridges. 

 There are the two inferior foramina, and one on the lower part of each side. 

 The articular flice for the neural arch is an oval i)it extendinjr the lenirth 

 of the centrum, and interrupted by some transverse ridges near the middle. 

 The vertebrae diminish in size posteriorly. Two centra, probably .sacral, 

 resemble the dorsals, but present an extensive vertical articular surface on 

 each side. This facet has raised edges, and terminates al)ove in the longitudinal 

 surface for the neural arch, having thus a T-shape ; it narrows beloAv to an 

 obtuse point, and. \w doubt, support(!d a free diapopliysis. 



The fragments of tiie pelvic and scapular arches indicate that thov are 



capacious. The clavicle incloses a large t()ranuM), and is ihickened on the 



inner edge. The glenoid surface of the coracoid was wide and subrhombic. 



Some oF tiie other bones are cpiitc thin. The median suture of tiu; isciiiiini 



12 c 



